Last summer's Arctic heatwave to top the 2011 record for polar ice sheet loss of 552 billion tonnes – study
Last summer's Arctic heatwave will likely top the 2011 record for polar ice sheet loss of 552 billion tonnes, they reported in a pair of studies, published Wednesday in Nature.Indeed, it is the added centimetres - perhaps added metres by the 22nd century - that make storm surges from climate-enhanced tropical cyclones so much more deadly and destructive, experts say.
Melting glaciers and the expansion of ocean water as it warms accounted for most sea level rise through the 20th century, but ice sheet melt-off has become a major driver over the last decade. The findings are grounded in decades of satellite data, in situ measurements, and computer modelling.The IPCC forecasts about half-a-metre of sea level rise by 2100 under the middle-of-the-road emissions scenario known as RCP4.5.
Over the last decade, sea level has risen about four millimetres per year. But moving into the 22nd century, the waterline is likely to go up ten times faster, even under an optimistic emissions scenario.
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